Electronics > Projects, Designs, and Technical Stuff

LCD Controller

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logictom:
I've been looking at an LCD for a project but I'm having trouble finding a controller.
The LCD is WVGA(800x480) 24bpp, what I'm looking for is something that will generate all the clk, hsync, vsync R[0-7] etc etc
I've found a couple of chips but nothing that does 24bpp and a few that do WVGA at 18bpp.
I found one (SSD1963QL9) but of course that can't be bought anywhere...

If I get the LCD this is the first time I will be working with something other than the 16x2 kind of LCD so I'm not sure if I'm barking up the wrong tree.
Is this the usual route to hooking up an LCD? Micro>Controller>LCD
Is this something I should implement using a second micro? I'm planning on using it in my Renesas design for the competition and there's not enough free pins to implement the controller, plus I figured it would eat up a fair chuck of the processing power.

If anyone has any ideas, advise or even a book recommendation for this sort of stuff I'd appreciate it  :)

jahonen:
Those things are usually used with a MCU with built-in LCD controller (ARM9 etc.), which takes care of all the dirty stuff. But it certainly is possible to roll your own, perhaps not with a MCU but a FPGA.

Regards,
Janne

jahonen:
I like to add that those LCD's are much more difficult to drive than those character monochrome ones, since they usually do not have internal display RAM, thus needing constant refresh from a controller with clock-cycle precise timings. Pixel clock is around 25 MHz or so, which makes it very difficult to drive from a MCU without dedicated LCD controller block.

A FPGA can do it (probably you still would need external RAM for display memory) but I guess that solution is out of scope in this case.

Regards,
Janne

CafeLogic:
Going from character to controller-less graphics is quite a leap. You might want to think about using one with a built in controller first. If you really want to do it. Here you go:

STM32 appnote about implementing the controller with the DMA
more info on that

PIC24 family with built in LCD Controller

My personal writeup on bit-banging it with a PIC32 (for monochrome stn)  

CafeLogic:
Just noticed your lofty resolution requirements. In that case, you might need something from the LPC1780 series. I don't know if they released it yet. Someone else was coming out with a chip with an on-board XGA controller also but I can't remember who it was, maybe Renases.

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